i can make it too easy, i know joomla and the addon called Virtuemart for joomla plataform, whith Virtuemart you can make a Ecommerce Store very easy, i can make the implementation in flash if you want, but if you show your products in flash you cant be indexed by google and others search engines.
the search engines cant see the text or conted in flash files, then the products items could not be indexed, this is important to get tons of visits and buyers.